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Engine-Codes – Generic – P0800

P0800 Code - Active Transfer Case Control Module Requested MIL Illumination

Quick Answer

The P0800 code refers to the Active Transfer Case Control Module Requested MIL Illumination. Common causes include Faulty transfer case control module, Malfunctioning sensors within the transfer case system, Wiring issues or electrical problems. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0800 indicates Active Transfer Case Control Module Requested MIL Illumination.
Common causes
Common causes include Faulty transfer case control module, Malfunctioning sensors within the transfer case system, Wiring issues or electrical problems.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P0800 Description

The P0800 code refers to the Active Transfer Case Control Module Requested MIL Illumination. This code indicates that the transfer case control module has detected a fault in the system that requires the malfunction indicator lamp (MIL) to be illuminated on the dashboard. The transfer case control module is responsible for managing the operation of the transfer case, which is a critical component in all-wheel drive and four-wheel drive vehicles. When this code is triggered, it can affect the vehicle's performance and drivability.

OBDII Code P0800 - Active Transfer Case Control Module Requested MIL Illumination
P0800 Code - Active Transfer Case Control Module Requested MIL Illumination

Common Causes of P0800

  1. Faulty transfer case control module
  2. Malfunctioning sensors within the transfer case system
  3. Wiring issues or electrical problems
  4. Software glitches or programming errors
  5. Mechanical issues within the transfer case itself

Symptoms of P0800

  1. Illumination of the Check Engine Light
  2. Difficulty shifting between drive modes (2WD, 4WD, etc.)
  3. Unusual noises coming from the transfer case
  4. Loss of power or acceleration
  5. Unresponsive controls for the transfer case

How to Fix P0800

  1. Diagnose the specific cause of the issue by using a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the transfer case system.
  2. Check the wiring and connections for any signs of damage or corrosion, and repair or replace as necessary.
  3. Test the sensors within the transfer case system to ensure they are functioning correctly, replacing any faulty sensors.
  4. Update the software in the transfer case control module to the latest version to address any programming errors.
  5. If mechanical issues are identified within the transfer case, repair or replace the damaged components.

Cost to Fix P0800

The cost of repairing the P0800 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the typical cost for this type of repair can range from $200 to $800, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on the location, vehicle make and model, and the hourly labor rates of the auto repair shop. It's recommended to obtain a detailed estimate from a qualified mechanic to get an accurate cost for the repair.

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Code P0800 Information for Specific Makes

  • P0800 Buick — Active Transfer Case Control Module Requested MIL Illumination
  • P0800 Cadillac — Active Transfer Case Control Module Requested MIL Illumination
  • P0800 Chevrolet — Active Transfer Case Control Module Requested MIL Illumination
  • P0800 GMC — Active Transfer Case Control Module Requested MIL Illumination
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0800 Code

1. What are the common symptoms of OBDII code P0800?

The common symptoms of OBDII code P0800 include the Check Engine Light (MIL) coming on, difficulty shifting gears, and issues with the transfer case control module.

2. What does the OBDII code P0800 indicate?

OBDII code P0800 indicates that the Active Transfer Case Control Module has requested the Malfunction Indicator Lamp (MIL) to illuminate, signaling a problem with the transfer case control system.

3. What are the possible causes of OBDII code P0800?

Possible causes of OBDII code P0800 include a faulty transfer case control module, wiring issues, a malfunctioning transfer case motor, or a problem with the vehicle's computer system.

4. How can I diagnose OBDII code P0800?

Diagnosing OBDII code P0800 involves using a diagnostic scanner to retrieve the code, checking the transfer case control module and motor for faults, and inspecting the wiring for any damage or loose connections.

5. Can I continue driving with OBDII code P0800 present?

It is not recommended to continue driving with OBDII code P0800 present, as it may lead to further damage to the transfer case system and potentially affect the vehicle's drivability.

6. How can I repair OBDII code P0800?

Repairing OBDII code P0800 typically involves replacing the faulty transfer case control module, repairing any damaged wiring, or addressing any issues with the transfer case motor as needed.

7. Is it possible to reset OBDII code P0800 without repairs?

Resetting OBDII code P0800 without addressing the underlying issue is not recommended, as the code is likely to reappear once the problem persists.

8. Can a DIY enthusiast fix OBDII code P0800?

Depending on the DIY enthusiast's skill level and access to tools, it may be possible to address OBDII code P0800 by replacing the transfer case control module or checking and repairing any wiring issues.

9. Will OBDII code P0800 affect fuel efficiency?

OBDII code P0800 may indirectly affect fuel efficiency if the transfer case control module issue leads to drivability problems that impact the vehicle's overall performance.

10. How much does it cost to repair OBDII code P0800?

The cost to repair OBDII code P0800 can vary depending on the underlying cause, parts needed for replacement, and labor charges. It is advisable to consult a professional mechanic for an accurate estimate.

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